Question

Beta-hCG quantitative serial measurement in normal vs ectopic pregnancy:

a. Normal pregnancy: Doubling every 48 hours, Ectopic pregnancy: Decreasing values
b. Normal pregnancy: Doubling every 72 hours, Ectopic pregnancy: Plateau or slow rise
c. Normal pregnancy: Quadrupling every 48 hours, Ectopic pregnancy: Increasing values
d. Normal pregnancy: Stable levels, Ectopic pregnancy: Doubling every 24 hours

Answer 1

In a normal pregnancy, the levels of beta-hCG double every 72 hours, while in an ectopic pregnancy, the levels plateau or have a slow rise.

Step-by-step explanation:

In a normal pregnancy, the levels of beta-hCG (human beta chorionic gonadotropin) should double every 48 to 72 hours. On the other hand, in an ectopic pregnancy (when the fertilized egg implants outside of the uterus), the levels of beta-hCG may either decrease, plateau, or have a slow rise.

Therefore, option b is the correct one: in a normal pregnancy, the levels of beta-hCG double every 72 hours, while in an ectopic pregnancy, the levels plateau or have a slow rise.